<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        //定义一个集合
        let arrayLike = {
            '0':'a',
            '1':'b',
            '2':'c',
            length:3
        }
        //转伪数组
        let arr2 = Array.from(arrayLike); //['a', 'b', 'c']
        console.log(arr2);
    </script>
</body>
</html>